Material:PU and Plastic Size:8"7"6"5"4.5"4"3" Thread:M14X2 Face:Velcro/Vinyle Sanding backing pads with velcro for using on polisher ,grinder to polish or clean the surface of metal, floor,marble etcThis is high quality pad.It is made with nylonfor back up pad,and the foam layer use PU for eliminating shake when the pad is sanding or buffing.P/NProduction DescriptionModelThread Size30020328'' ...